Phase diagram of the ferromagnetic shape memory alloys Ni2MnGa1-xCox

作者：Kanomata T^*; Nunoki S; Endo K; Kataoka M; Nishihara H; Khovaylo V V; Umetsu R Y; Shishido T; Nagasako M; Kainuma R; Ziebeck K R A

来源：Physical Review B, 2012, 85(13): 134421.

DOI：10.1103/PhysRevB.85.134421

Permeability, magnetization, and differential scanning calorimetry measurements are carried out on the ferromagnetic shape memory alloys Ni2MnGa1-xCox (0 <= x <= 0.20). On the basis of the experimental results, the phase diagram in the temperature-concentration plane is determined. The determined phase diagram is spanned by a paramagnetic austenite (Para-A) phase, paramagnetic martensite phase, ferromagnetic austenite phase, ferromagnetic martensite (Ferro-M) phase, and a premartensite phase. The measurements show that a magnetostructural transition between the Para-A and Ferro-M phases does not appear in this alloy system. The phase diagram is discussed using phenomenological Landau theory.

• 出版日期2012-4-11